<template>
  <div class="user-info-head" @click="editCropper()">
    <el-avatar :size="100" :src="options.img"/>
    <el-dialog :title="title" v-model="dialogVisiable" width="600px" append-to-body @opened="modalOpened"
               @close="closeDialog">
      <el-row>
        <el-col class="flex justify-center">
          <vue-cropper
              ref="cropper"
              :img="options.img"
              :info="true"
              :autoCrop="options.autoCrop"
              :autoCropWidth="options.autoCropWidth"
              :autoCropHeight="options.autoCropHeight"
              :fixedBox="options.fixedBox"
              :outputType="options.outputType"
              @realTime="realTime"
              :centerBox="true"
              v-if="visible"
              class="cropper"
          />
        </el-col>
      </el-row>
      <br/>
      <el-row class="flex justify-center">
        <el-col :lg="2" :md="2">
          <el-upload action="#" :http-request="requestUpload" :show-file-list="false" :before-upload="beforeUpload">
            <el-button type="success">
              选择
              <el-icon class="el-icon--right">
                <Plus/>
              </el-icon>
            </el-button>
          </el-upload>
        </el-col>
        <el-col :lg="{ span: 1, offset: 2 }" :md="2">
          <el-button icon="RefreshLeft" @click="rotateLeft()"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 2 }" :md="2">
          <el-button icon="RefreshRight" @click="rotateRight()"></el-button>
        </el-col>
        <el-col :lg="{ span: 2, offset: 2 }" :md="2">
          <el-button type="primary" @click="uploadImg()">更新头像</el-button>
        </el-col>
      </el-row>
    </el-dialog>
  </div>
</template>

<script setup>
import 'vue-cropper/dist/index.css';
import {VueCropper} from 'vue-cropper';
import {useUserInfo} from '/@/stores/userInfo';
import {getCurrentInstance, nextTick, reactive, ref, computed, onMounted, defineExpose} from 'vue';
import {base64ToFile} from '/@/utils/tools';

const userStore = useUserInfo();
const {proxy} = getCurrentInstance();

const open = ref(false);
const visible = ref(false);
const title = ref('修改头像');
const emit = defineEmits(['uploadImg']);
const props = defineProps({
  modelValue: {
    type: Boolean,
    default: false,
    required: true,
  },
});
const dialogVisiable = computed({
  get() {
    return props.modelValue;
  },
  set(newVal) {
    emit('update:modelValue', newVal);
  },
});

//图片裁剪数据
const options = reactive({
  img: userStore.userInfos.avatar, // 裁剪图片的地址
  fileName: '',
  autoCrop: true, // 是否默认生成截图框
  autoCropWidth: 200, // 默认生成截图框宽度
  autoCropHeight: 200, // 默认生成截图框高度
  fixedBox: true, // 固定截图框大小 不允许改变
  outputType: 'png', // 默认生成截图为PNG格式
});

/** 编辑头像 */
function editCropper() {
  dialogVisiable.value = true;
}

/** 打开弹出层结束时的回调 */
function modalOpened() {
  nextTick(() => {
    visible.value = true;
  });
}

/** 覆盖默认上传行为 */
function requestUpload() {
}

/** 向左旋转 */
function rotateLeft() {
  proxy.$refs.cropper.rotateLeft();
}

/** 向右旋转 */
function rotateRight() {
  proxy.$refs.cropper.rotateRight();
}

/** 图片缩放 */
function changeScale(num) {
  num = num || 1;
  proxy.$refs.cropper.changeScale(num);
}

/** 上传预处理 */
function beforeUpload(file) {
  if (file.type.indexOf('image/') == -1) {
    proxy.$modal.msgError('文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。');
  } else {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => {
      options.img = reader.result;
      options.fileName = file.name;
    };
  }
}

/** 上传图片 */
function uploadImg() {
  // 获取截图的 base64 数据
  proxy.$refs.cropper.getCropData((data) => {
    let img = new Image();
    img.src = data;
    img.onload = async () => {
      let _data = compress(img);
      const imgFile = base64ToFile(_data, options.fileName);
      emit('uploadImg', imgFile);
    };
  });
}

// 压缩图片
function compress(img) {
  let canvas = document.createElement('canvas');
  let ctx = canvas.getContext('2d');
  // let initSize = img.src.length;
  let width = img.width;
  let height = img.height;
  canvas.width = width;
  canvas.height = height;
  // 铺底色
  ctx.fillStyle = '#fff';
  ctx.fillRect(0, 0, canvas.width, canvas.height);
  ctx.drawImage(img, 0, 0, width, height);
  // 进行压缩
  let ndata = canvas.toDataURL('image/jpeg', 0.8);
  return ndata;
}

/** 关闭窗口 */
function closeDialog() {
  options.visible = false;
  options.img = userStore.userInfos.avatar;
}

const updateAvatar = (img) => {
  options.img = img;
};

defineExpose({
  updateAvatar,
});
</script>

<style lang="scss" scoped>
.user-info-head {
  position: relative;
  display: inline-block;
  height: 120px;
}

.user-info-head:hover:after {
  content: '修改头像';
  position: absolute;
  text-align: center;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  color: #000000;
  font-size: 20px;
  font-style: normal;
  cursor: pointer;
  line-height: 110px;
}

.cropper {
  height: 400px;
  width: 400px;
}
</style>
